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【单选题】
在完全竞争条件下，利润最大化实际上就是（ ）A.
获得了无限大的利润
B.
获得了正常利润
C.
获得了超额利润
D.
获得了贡献利润
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【单选题】交换机是一种___________设备.
A.
数据转换
B.
存储转发
C.
存储
D.
信息广播
E.
：B
F.
：单选题
G.
、若“学生”表中存储了学号、姓名、性别、成绩等字段，则“删除所有女学生记录”的SQL语句是___________。
H.
DELETE * FROM 学生 WHERE 学生.性别=“女”
I.
DELETE FROM 学生 WHERE 学生.性别=女
J.
DELETE FROM 学生 WHERE 学生.性别=“女” K. DELETE * FROM 学生 WHERE 学生.性别=女
【单选题】Suppose the Alaskan king crab harvest is unregulated and any person with a crab boat and some diesel fuel can go offshore, lower a crab pot, and harvest king crab. As a result, this common resource is...
A.
Alaska subsidizes the purchase of crab boats.
B.
Alaska auctions a limited number of licenses to harvest king crab.
C.
Alaska removes taxes on diesel fuel, which lowers the price of diesel.
D.
The U.S. and Canadian governments remove trade barriers, which allows for more trade of products like king crab.
【简答题】He managed to _____ her hand in the desperate situation, but failed. A. crab B grab C. slab D. slam
【简答题】The Yangcheng lake crab is No. But what is available are ______.
【单选题】The crab’s colour—changing ability was probably developed ______.
A.
in the process of evolution ( 进化 )
B.
over millions of years
C.
by the work of biologists
D.
both A and B
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